Column turning, honing, and polishing machine



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1 l 4 .1 n v VA I May 24, 1932- D. M. MILLS COLUMN TURNING, HONING, AND POLISHNG MACHINE Filed March ll, 1929 4 Sheets-Sheet 2 May 24 1932- D. M. MILLS 1,859,595

COLUMN TURNING, HONING, AND POLISHTNG MACHINE Filed March 11, 1929 4 sheets-sheet 3 (l) 1Q s w Il E n e l A .J Y 1 Q /N l/E/v rae: l aaasy /7. /V/cas.l

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COLUMN TURNING, HONING, AND POLISHTNG MACHINE Filed Maron l1, 1929 4 Sheets-Sheet 4 /fv l/E/v roe: 000651/ /7 V/.LL Pf 44 TTOE/VEX Patented May Z4, 1932 UNITED STATES .PATENT Fries DUDLEY M. MILLS, OF LOS ANGELES, CALIFORNIA, ASSIGNOR 'IO MUSTO-KEENAN GOM- PANY, OF LOS ANGELES, CALIFORNIA, A CORPORATION OF CALIFORNIA COLUMN TURNING, HONING, AND POLISHIN G MACHINE Application filed March 11,

This invention relates to marble turning machines, and particularly to a machine for turning marble columns, as well as honing and polishing the same.

As is well known in the art, a great deal of trouble has been experienced in turning marble columns, particularly in turning vcolumns of considerable length to small diameters. g

In turning marble columns, a revolving grinding wheel is ordinarilyy used, and the grinding operation necessitates the imparting of considerable pressure upon the grinding wheel which contacts the periphery of the revolving marble column. When grinding midway on the body of a column, this lateral pressure imposed on the column often results in a broken or a split column. It is well known by those skilled in the` art that when turning small diameter columns of some particularly brittle grade of marble, often fully titty percent. of the columns are broken or cracked before completion, which causes tremendous loss in material and workmanship.

I have found by experiment that if the lateral pressure of the grinding member be equalized, in other words, if equal pressure is applied diametrically to the periphery of a column during turning operations, much smaller diameter columns can be turned safely and quickly, the loss from broken or split columns being negligible.

It is therefore an object of this invention to y provide a machine for turning marble columns in which an equal lateral pressure is applied to both sides of a column during turning operations.

'It is another object to provide rotating grinding members on each side of a column to 1929. serial No. 345,969.

griving means for each of said grinding memers.

It is still another object to provide a carriage for supporting both of said grinding members, and means for moving the carriage longitudinally relative to the column being turned.

It is also an object to provide a marble column, honing and polishing apparatus which may be substituted for the grinding mechanism of my turning machine.

Other objects reside in the details of construction, as will be apparent from a perusal of the following specification, the accompanying drawings and the appended claims.

Referring to the drawings,

Fig. 1 is a top plan view of my marble column turning machine.

Fig. 2 is an end elevation taken as indicated by the arrow 2 of Fig. 1. y

Fig. 3 is a diagrammatic skeleton view of the mechanism for causing a pair of grindingmember-supporting-brackets to move laterally. This view is taken somewhat as indicated by the line 3-3 of Fig. 2,'the impertinent parts being omitted.

Fig. 4 is a top plan view of my machine showing the honing and polishing apparatus installed.

Fig. 5 is a section taken as indicated by the line 5 5 of Fig. 4:.

Fig. 6 is a section taken as indicated by the line 6-6 of Fig. 4.

Fig. 7 is an enlarged sectional view corresponding to parts indicated within the dotted circle A of Fig. 6.

Fig. 8 is a perspective view of the hone clamp shown in Fig. 7.

Fig. 9 is a sectional view whose corresponding parts are indicated within the dotted circle B oi' Fig. 6.

Fig. 10 is a view comparable to Fig. 7 but showing a polishing brush installed in place of a hone.

Referring to Figs. 1, 2 and 3 of the drawings,` I have shown a turning machine 11 having a concrete base 12. Supported upon the base 12 is a bed 13 having ways 14C formed thereon. Carried by the ways 14 and longitudinally slidable thereon is a tail-stock member 15 which suspends one end of a marble column 16 in a well known manner. The other end of the column 16 is supported b y a face plate 17 having a central pin 18 and a plurality of radially spaced pins 19, all of which extend into properly spaced concavities in the end of the column 16. The face plate 17 is secured to a shaft 2O and is rotatable therewith. The shaft 20 is included in a driving mechanism comprising a cone pulley 21 and a belt 22 communicating with a source of power not shown. l

Coming now to the more pertinent details of my invention, I have shown a pair of rails 23 spaced on either side of the bed 13. The rails 23 cooperate with the ways 14 to support a carriage 24. The carriage 24 includes a laterally extending saddle25 which is supported centrally by the ways 14,- and is supported at each end by a truck member indicated generally by the numeral 26;

I provide a pair of grinding-wheel-supporting brackets 27 which are slidably dovetailed upon the saddle 25 on opposite sides of the column 16.

Referring now to Fig. 3 of the drawings, I show the brackets 27, carried by the saddle 25, each in threaded engagement with a screw shaft 28, the outer ends 29 of said shafts extending through the frame-of the truck mem-- ber 26 and being held against lateral movementby collars 30, the screw shafts 28, however, being free to rotate. the screw shafts 28 are gears 31 meshing with driving gears 32. The gears 32 aremanually operated by hand wheels 33 mounted on shafts 34 which extend from the respective gears 32 to a position near the side of the machine, as shown.

Carried by the brackets 27vare bearings35 which journal shafts 36. Intermediate of the bearings 35 are driven sprockets 37 which are keyed on each shaft 36.

Rigidly supported on the brackets 27 are outwardly extending tables 38, each of which carries an electric motor 39. Each motor 39 has a drive shaft 40 extending through a bearing member 41, as shown in Fig. 1, and carries at its outer end a drive sprocket 42, each of which is connected to the adjacent driven sprocket 37, by a sprocket chain 42a.

Mounted on the shafts 36- are grinding wheels 43, which are pressed tightly against a shoulder 44 on the shaft 36 by a nut 45. The carriage 24 is caused to move longitudinally relative to the column 16 by well known mechanism comprising a Worm wheelA 46 keyed to a shaft 47 supported longitudinally along the bed 13 by brackets 48. The worm wheel. 46 engages a rack 49 integral with the saddle 25. The shaft 47 is rotated by a reverse gear train indicated at 51 which connects the shaft 47 with a main drive gear 52 mounted on the shaft 20.

The operation of my invention is as fol- Mounted upon lows lVith the column 16, suspended by the tail stock member 15 and the face plate 17, rotating in the direction of the arrow 60 of Fig. 2, and the grinding members 43 being driven by their respective motors 39 in 'the directions indicated by the arrows 61 and 62 of Fig. 2, the hand wheels 33 may be manipulated to cause the grinding wheels 43 to separately or simultaneously move inward in the directions indicated by the arrows 63 of Fig. 2 until both contact the periphery of the column 16. The gearing 51 may now bc manipulated to cause the carriage 24 to be moved along the rails 23 and the ways 14 in the direction of the arrow 64 of Fig. 1.

It will be noticed from an inspection of Fig. 1 .that one of the cutting members is positioned ahead of the other so that each will cut at a diderent level relative to the longitudinal axis of the column 16. This is important due to the fact that were the grinding members exactly aligned, one must necessarily take a cut twice the depth of the other toaccomplish the same amount of work.

It will be noticed from an inspection of Fig. 2 that the grinding members 43 are diametrically opposite. This is important inasmuch as it permits an exact equalization of pressurey on opposite sides of the column 16, effectually preventing the tendency of small diameter columns to bend.

As is well known in the art, when the grinding members have completed a cut throughout thel entire length of the column 16, the reverse gearing is operated to return the carriageV to the position in which it is shown in Fig. 1, and a new cut may be made.

Referring now to the honing and polishing apparatus illustrated in Figs. 4 to 10 inclusive, in which corresponding parts are numbered the same, I provide a hone carriage 65. The carriage 65 comprises longitudinal frame members 66 and a lateral frame member 67, including slide mmebers 68 adapted to be carried-by the ways 14. Supported by the frame members 66 on either side of the column 16 is a plurality of vertically extending` arms 69. The arms 69 are flexibly attached to the members 66 as shown in Fig. 9. Each of the vertical arms 69 has a drilled hole 7 0 near its lower end. A rubber block 71 having an opening 72 is interposed between the arm 69 and the frame member 66', the latter having a drilled hole 7.3 communicating with the opening 72 and the drilled hole 70. A bolt and nut 74 extend therethrough in a manner to securely but flexibly support the arm 69.

Secured to each arm 69 is a U-shaped hone clamp 75 adapted to retain a hone block 76. The clamp 75 has an integral threaded pin 7 5a extending through a drilled hole 77 in the arm 69 and a nut 78 rigidly secures the same as shown in Fig. 7.

As shown in Fig. 10 a polishing brush 79 having a threaded pin 80 may be secured t0 arm 69 in the same manner to replace the hone clamp after the honing operation has been completed.

At the upper ends of each of the arms 69 on one side ot the column 16 is secured a strong tension spring 81. This spring is adapted to be stretched across the column 16 and attached to the upper end of the oppositely disposed arm 69 on the other side oi the column 16, for the purpose of resiliently holding the hone blocks 76' against the periphery of the column 16. Pivoted at 82 to the bed 13 of the Ina-chine 11 is a lever 82a, Which extends laterally across the bed 13. Connecting the lever 82a With one of the lateral frame members 67 is a link 83. The lever 82a is adapted to be manually operated as shovvn by dotted lines 84 and 85 to cause the hone carriage 65 carrying the hone blocks 76 to reciprocate longitudinally in the direction of the double arrow 90 of Fig. d, this movement being great enough to allovv the entire surface ot the column 16 to be honed and polished.

The operation of my honing and polishing apparatus Will I believe be apparent from the foregoing, it being understood that the grinding mechanism at the completion of the turning operation will be remotely positioned on the rails 23 so as to not interfere with the installation and operation of the honing and polishing apparatus.

It should be understood in conclusion that I base my claims upon the fact that I have accomplished new and greatly improved results by the use of diametrically opposed grinding members, in a machine for turning marble columns, by making possible an equalization of pressure on each side of a column during the cutting operation.

It should also be understood that although I have herein shown and described only one complete embodiment of my invention, I am aware that various features might be changed and numerous embodiments of my invention might be devised by those skilled in the art Without departing Jfrom the spirit and scope ot my invention.

I claim as my invention:

1. In a marble column turning machine the combination of arigidbase column suspending means comprising a bed having a Way adapted to slidably support a tail stock member suspending one end of a column, and a head stock member, including a tace plate suspending the opposite end of said column and driving means tor rotating said tace plate; and a plurality7 of marble shaping members adapted to substantially diametrically contact said column for the purpose of obtaining a desired equalization of pressure on opposite sides of said column during turning operations, one of said shaping members being otlset in axial direction relative to the other of said shaping members.

i V2. In a marble column turning machine the combination of a rigid base; column suspendingmeans comprising a bed having a Way adapted to slidably support a tail stock memloer suspending one end of a column, and a head stock member, including a face plate suspending the opposite end of said column. and driving means for rotating said face plate and said column; a rotatable marble grinding member operably supported on either side of said column adapted to substantially diametrically engage the same, one ot said grinding members being forwardly oftsetl in axial direction relative to the other of said grinding members; driving means for rotating said grinding members; means for causing said grinding members to move longitudinally relative to said column; and means tor moving said grinding members laterally relative to said column.

3. In a marble column turning machine the combination of: a rigid base; column suspending means comprising a bed having a Way adapted to slidably support a tail stock member suspending one end of a column, and a head stock member, including a face plate suspending the opposite end of said column and driving means for rotating said face plate and said column; a rotatable marble grinding member operably suppo-rted on either side of said column adapted to substantially diametrically engage the same, one of said grinding members being forwardly offset in axial direction relative to the other of said grinding members; individual driving means for rotating each of said grinding members in a direction opposite to the direction ot movement of that portion of the periphery of said column, which each grinding member engages; means for causing said grinding members to move longitudinally relative to said column; and means for separately moving said rotating members laterally relative to said column, for the purpose of obtaining a variable cutting depth of each grinding member and a desirable equalization of pressure on opposite sides of said column during turning operations.

d. A marble column turning machine of the class described comprising: column suspending means supporting a column and means for revolving the same, in combination With a pair o rails, a carriage supported on said rails and longitudinally movable thereon relative to said column; a grinding member supporting bracket on either side of said column, having dovetail connections With said carriage, and laterally slidable thereon relative to said column; a shaft ournalled on each ot said brackets, each of said shafts carrying a. marble-grinding Wheel, the axis of said Wheels being substantially diametrically opposite relative to the diameter of said column, one of said Wheels being offset in axial direc.- tion relative to the other of said Wheels; driving Ameans comprising a motor supported by each of said brackets, each of said motors having sprocket and chain connection with one of said shafts; means including a rack and a Worm gear for moving said carriage longitudinally relative to said column; and means including manually operable screw shafts threadably engaging said supporting brackets for moving said brackets on said carriage laterally relative to said Column.

In testimony whereof, I have hereunto set my hand at Los Angeles, California, this 6th day of March, 19:29.

DUDLEY M. MILLS. 

